Rhizopods are heterotropic protozoans lacking permanent locomotive organelles like cilia or flagellae. To move and to catch prey, they use transient cellular extensions, the so called pseudopods. According to their shape and organization they are called lobopods (lobular), filopods (fathom-like), rhizo- or reticulopods (net-like) and axopods (more or less stable and fixed). The different pseudopodial extensions are also used for classification.